Lisa Jones, left, bureau chief for the Nevada State Health Division's Bureau of Licensure and Certification, Brian Labus, center, Southern Nevada Health District (SNHD) senior epidemiologist, and Dr. Lawrence Sands, SNHD chief health officer, hold a news conference at the health district Wednesday, February 27, 2008. The health district is notifying about 40,000 former patients of the Endoscopy Center of Southern Nevada that they may have been exposed to hepatitis C.